From the Grand Rapids Press:

A half-century after alewives disrupted Great Lakes fisheries and trashed beaches, another invasive fish is engaged in a biological conquest of the world’s largest freshwater ecosystem.

The round goby is taking over large swaths of the Great Lakes and their connecting waters, according to scientists studying the invader. Gobies breed like rabbits and eat like pigs, causing profound changes at the base of a food chain that supports the Great Lakes $7 billion sport and commercial fisheries. Read more.